43SN | pdb_000043sn

Deposited: 2026-07-15 Released: 2026-08-26
Deposition Author(s): Chen, H., Sun, D., Tian, C.
Funding Organization(s): National Natural Science Foundation of China (NSFC)

Experimental Data Snapshot

wwPDB Validation 3D Report Full Report

This is version 1.0 of the entry. See complete history.

(2026) Chem Commun (Camb)

PubMed Abstract:
Peptides targeting the α7 nicotinic acetylcholine receptor (α7-nAChR) represent promising candidates for therapeutic and chemical probe development. Here, we identified a novel bicyclic peptide KP1877 via phage-displayed peptide library screening followed by chemical synthesis of active analogs. Structural characterization reveals KP1877 adopts a unique bicyclic conformation distinct from known natural α7-nAChR-targeting peptides, and exerts potent inhibitory effect by stabilizing the closed, non-conducting state of the receptor via orthosteric binding.

Organizational Affiliation

Hefei National Laboratory for Physical Sciences at the Microscale, Department of Clinical Laboratory, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, Anhui Provincial Engineering Laboratory of Peptide Drugs, University of Science and Technology of China (USTC), Hefei 230026, China. dmsun@ustc.edu.cn.

Macromolecule Content

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| 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Neuronal acetylcholine receptor subunit alpha-7	A, C, E, G, I	502	Homo sapiens	Mutation(s): 0 Gene Names: CHRNA7, NACHRA7
UniProt & NIH Common Fund Data Resources
Find proteins for P36544 (Homo sapiens) Explore P36544 Go to UniProtKB: P36544
GTEx: ENSG00000175344
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P36544
Glycosylation
Glycosylation Sites: 3	Glycosylation Focus chain A Focus chain C Focus chain E Focus chain G Focus chain I	Go to GlyGen: P36544-1
Sequence Annotations Expand
Reference Sequence

Find similar proteins by: Sequence | 3D Structure

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
synthetic peptide KP1877	B, D, F, H, J	17	synthetic construct	Mutation(s): 0
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
Sequence Annotations Expand
Reference Sequence

Entity ID: 3
Molecule	Chains	Length	2D Diagram	Glycosylation	D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose	K, L, M, N, O K, L, M, N, O, P, Q, R, S, T	2		N-Glycosylation	Interactions Focus chain K Focus chain L Focus chain M Focus chain N Focus chain O Focus chain P Focus chain Q Focus chain R Focus chain S Focus chain T Interactions & Density Focus chain K Focus chain L Focus chain M Focus chain N Focus chain O Focus chain P Focus chain Q Focus chain R Focus chain S Focus chain T

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
NAG Query on NAG Download:Ideal Coordinates CCD File SDF format, chain Y [auth I] SDF format, chain X [auth G] SDF format, chain W [auth E] SDF format, chain V [auth C] SDF format, chain U [auth A] MOL2 format, chain Y [auth I] MOL2 format, chain X [auth G] MOL2 format, chain W [auth E] MOL2 format, chain V [auth C] MOL2 format, chain U [auth A] mmCIF format, chain Y [auth I] mmCIF format, chain X [auth G] mmCIF format, chain W [auth E] mmCIF format, chain V [auth C] mmCIF format, chain U [auth A]	U [auth A], V [auth C], W [auth E], X [auth G], Y [auth I]	2-acetamido-2-deoxy-beta-D-glucopyranose C₈ H₁₅ N O₆ OVRNDRQMDRJTHS-FMDGEEDCSA-N		Interactions Focus chain U [auth A] Focus chain V [auth C] Focus chain W [auth E] Focus chain X [auth G] Focus chain Y [auth I] Interactions & Density Focus chain U [auth A] Focus chain V [auth C] Focus chain W [auth E] Focus chain X [auth G] Focus chain Y [auth I]